Abstract

PAEZ, Manuel S; ALVIS, Armando  and  ARRAZOLA, Guillermo. Volumetric Properties of Trifluorometanosulfonato 1-ethyl-3-Metilimidazolio in Aqueous Solution of Pentahydrated Sodium Thiosulfate at Different Temperatures. Inf. tecnol. [online]. 2015, vol.26, n.5, pp.105-112. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642015000500014.

Densities of pseudobinary mixture of water  1-ethyl-3-methyl-imidazolium trifluoromethanesulfonate (Emim  CF₃SO₃  )  aqueous solution of sodium thiosulfate pentahydrate (Na₂S₂O₃.5H₂O) were experimentally determined at temperatures from 283.15 to 318.15 K, using an Anton Paar model DMA 5000 vibrating tube densitometer. From these data the apparent molar volumes(V_Φ⁰), limiting apparent volumes (V_Φ⁰) and standard volumes of transfer ( _trV_Φ⁰) were calculated. The limiting apparent molar volume was correlated with the temperature leading to a negative second derivative of the limiting apparent molar volume respect to the temperature  . This fact could indicate that Emim  CF₃SO₃   behaves as a solute capable of braking the solvent structure, while the positive value for  _trV_Φ⁰ could indicate the prevalence of ion-ion interactions in the solution, which confirms the results of Hepler´s criterion.

Keywords : trifluorometanosulfonato 1-ethyl-3-metilimidazolio; density; apparent molar volume; solute-solvent interactions.

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